Greenbo Railing and Deck Planter, Pink, 2 pack The ONLY planter that fits securely on ALL railing shapes (round, oval, rectangular, etc.) and sizes up to 4''/10cm wide Patented design holds planter firmly on railing Self-mounting -- no screws, brackets or other hardware necessary No-drip drainage system recycles water Patented anchoring mechanism for theft protection, Sustainable, durable and 100% weatherproof